Merge branches 'for-4.3/chicony', 'for-4.3/cp2112', 'for-4.3/i2c-hid', 'for-4.3/lenov...

[linux-drm-fsl-dcu.git] / drivers / hid / hid-multitouch.c

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index ab0434f86f49d6841ae3f33cd42b4782e3d6bdb4..426b2f1a34501c7516ab39dc631d3c2073591aac 100644 (file)
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -778,9 +778,16 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
        /*
         * some egalax touchscreens have "application == HID_DG_TOUCHSCREEN"
         * for the stylus.
+        * The check for mt_report_id ensures we don't process
+        * HID_DG_CONTACTCOUNT from the pen report as it is outside the physical
+        * collection, but within the report ID.
         */
        if (field->physical == HID_DG_STYLUS)
                return 0;
+       else if ((field->physical == 0) &&
+                (field->report->id != td->mt_report_id) &&
+                (td->mt_report_id != -1))
+               return 0;
 
        if (field->application == HID_DG_TOUCHSCREEN ||
            field->application == HID_DG_TOUCHPAD)